KR102772235B1 - Method for construction of freezing prevention using eco-friendly deicer composition and crumb rubber - Google Patents

Abstract

The present invention relates to a method for constructing a snow-melting pavement, comprising: a pretreatment step of preparing a base surface on which a snow-melting pavement is to be constructed; a laying step of laying an asphalt mixture containing aggregate, asphalt, and a snow-removing additive on the prepared base surface to form a pavement layer; and a curing step of curing the pavement layer to form a snow-melting pavement layer; wherein the snow-removing additive comprises at least one of an eco-friendly snow-removing agent capsule and waste tire rubber, and wherein the eco-friendly snow-removing agent capsule comprises: a core containing an eco-friendly snow-removing agent; and a capsule layer encapsulating the core; and wherein the eco-friendly snow-removing agent comprises at least one of calcium magnesium acetate, potassium acetate, sodium acetate, potassium formate, and sodium formate.

Description

{Method for construction of freezing prevention using eco-friendly deicer composition and crumb rubber}

The present invention relates to an environmentally friendly deicing agent and a snow melting pavement construction method using waste tire rubber, and more specifically, to a snow melting pavement construction method using an encapsulated environmentally friendly deicing agent, which can stably implement anti-freezing performance for a long period of time and promote ice crushing due to the elasticity of waste tire rubber, thereby obtaining freeze inhibition and ice removal effects.

In the winter snow season, friction agents such as sand or anti-icing agents such as calcium chloride are sprayed to ensure smooth road traffic, or snow removal vehicles are used to remove snow whenever it accumulates. In the case of snow removal using this method, the accumulated snow must be removed in a short period of time so as not to interfere with road traffic, and to do this, a large amount of equipment and manpower must be deployed to perform the work quickly, which is difficult.

Black ice, which is caused not only by snow but also by frost or freezing, has a high possibility of causing major traffic accidents with a high fatality rate. However, unlike snow, it is difficult to determine whether it has occurred, making removal by manpower even more difficult.

In particular, it is known that traffic accident deaths due to black ice caused by frost or ice are about three times more common than traffic accident deaths due to snow, and the traffic accident fatality rate due to black ice is known to increase nearly threefold when the average winter temperature exceeds 2℃.

Meanwhile, there are two ways to prevent traffic paralysis due to snowfall: a physical method of spraying friction materials and a chemical method of spraying anti-icing agents. The method of spraying friction materials such as sand or crushed stone to prevent slipping has no effect on melting snow, and when additional snow falls, the friction materials are buried in the snow, making it difficult to expect an anti-slip effect. The method of removing snow by lowering the freezing point, such as calcium chloride, sodium chloride, acetate, ethylene glycol, or propylene glycol, has a problem in that although the viscosity of these anti-icing agents or their aqueous solutions is low, they easily flow down from the road surface, so the anti-icing effect is fast, but it lacks sustainability. Therefore, there is the inconvenience of having to re-spray anti-icing agents frequently every time snow falls, and chloride salts such as calcium chloride or sodium chloride have side effects such as environmental pollution due to chloride accumulation and corrosion of vehicles and bridges.

Accordingly, it is necessary to develop a new snow melting method that does not cause environmental pollution problems and can maintain the freezing point lowering effect of anti-icing agents for a long period of time.

Patent Registration No. 10-2617402 (Registered on December 19, 2023)

The present invention provides an eco-friendly deicing agent including an encapsulated eco-friendly deicing agent, which can stably implement anti-icing performance for a long period of time, and can obtain freeze-inhibiting and ice-removing effects by promoting ice crushing due to the elasticity of waste tire rubber, and a snow-melting pavement construction method using waste tire rubber.

One embodiment of the present invention for achieving the above-described purpose includes a pretreatment step of preparing a base surface on which a snow-melting pavement is to be constructed; a laying step of forming a pavement layer by laying an asphalt mixture including aggregate, asphalt, and snow-removing additives on the prepared base surface; and a curing step of curing the pavement layer to form a snow-melting pavement layer.

The above-mentioned snow removal additive may include environmentally friendly snow removal agent capsules and/or waste tire rubber.

The above eco-friendly de-icing agent capsule may include a core including an eco-friendly de-icing agent; and a capsule layer encapsulating the core.

The above asphalt mixture may contain 5 to 30 parts by weight of asphalt and 1 to 19 parts by weight of a snow-removing additive per 100 parts by weight of aggregate.

The above asphalt mixture may further contain 3 to 9 parts by weight of modified sulfur per 100 parts by weight of aggregate.

The above core may be made of or include at least one eco-friendly deicing agent selected from the group consisting of calcium magnesium acetate, potassium acetate, sodium acetate, potassium formate, sodium formate, ethylene glycol, and propylene glycol.

The above eco-friendly de-icing agent capsule can be manufactured through a core preparation step of preparing a core containing an eco-friendly de-icing agent; and an encapsulation step of reacting the core with a polymerizable polymer and an initiator to encapsulate the core.

The above core may be a porous material such as zeolite and/or diatomaceous earth impregnated with an environmentally friendly deicing agent.

The above eco-friendly de-icing agent capsule can be manufactured through a core preparation step of preparing a core containing an eco-friendly de-icing agent; and an encapsulation step of reacting the core with a polymerizable polymer and an initiator to encapsulate the core.

The above core can be manufactured by immersing a porous material in an eco-friendly deicing agent aqueous solution or spraying the eco-friendly deicing agent aqueous solution onto the porous material, thereby impregnating the porous material with the eco-friendly deicing agent aqueous solution.

The snow melting paving construction method of the present invention can prevent road damage, corrosion, and vehicle corrosion problems caused by chloride, and environmental pollution, by using an environmentally friendly deicing agent that does not contain chloride.

In addition, since the eco-friendly deicing agent exists in a form encapsulated by a water-soluble capsule layer, the deicing agent is not quickly dissolved and consumed when it rains or snows, but is slowly dissolved, so the eco-friendly deicing agent can prevent black ice formation and provide a snow removal effect for a long period of time.

In addition, since the elasticity of the paving layer is improved by including waste tire rubber, the crushing of ice is promoted by the deformation caused by the load of the vehicle, thereby removing the frozen portion and easily exposing the eco-friendly deicing agent to the surface, thereby improving the anti-icing effect.

Figures 1 and 2 are photographs of the results of an experiment to determine whether encapsulation is in progress.
Figure 3 is a photograph of a porous material impregnated with a deicing agent.
Figure 4 shows the TGA analysis results of the capsule layer.
Figure 5 is a photograph of the results of an anti-icing experiment on asphalt pavement.

Before explaining in detail the preferred embodiments of the present invention below, it should be noted that the terms and words used in this specification and claims should not be interpreted as limited to their usual or dictionary meanings, but should be interpreted as meanings and concepts consistent with the technical spirit of the present invention.

Throughout this specification, whenever a part is said to “include” a component, this does not exclude other components, but rather includes other components, unless otherwise stated.

Throughout this specification, “%” used to indicate the concentration of a particular substance means (weight/weight)% for solid/solid, (weight/volume)% for solid/liquid, and (volume/volume)% for liquid/liquid, unless otherwise stated.

Hereinafter, examples of the present invention will be described. However, the scope of the present invention is not limited to the preferred examples below, and those skilled in the art can implement various modified forms of the contents described in this specification within the scope of the present invention.

The present invention relates to an environmentally friendly deicing agent and a snow melting pavement construction method using waste tire rubber, and more specifically, to a snow melting pavement construction method using an encapsulated environmentally friendly deicing agent, which can stably implement anti-freezing performance for a long period of time and promote ice crushing due to the elasticity of waste tire rubber, thereby obtaining freeze inhibition and ice removal effects.

A snow melting pavement construction method according to one embodiment of the present invention comprises a pretreatment step of preparing a base surface on which a snow melting pavement is to be constructed; a laying step of forming a pavement layer by laying an asphalt mixture containing aggregate, asphalt, and snow removal additives on the prepared base surface; and a curing step of curing the pavement layer to form a snow melting pavement layer.

The above pretreatment step is a step to prepare the base surface on which the snow melting paving will be constructed. It is a step to remove foreign substances, unevenness, and deteriorated areas existing on the base surface and to make the base surface smooth.

The above-mentioned laying step is a step of forming a pavement layer by laying an asphalt mixture containing aggregate, asphalt, and snow-removing additives on a cleaned base surface. Specifically, the asphalt mixture may contain 5 to 30 parts by weight of asphalt and 1 to 19 parts by weight of snow-removing additives per 100 parts by weight of aggregate.

Prior to this laying step, if necessary, an additional step may be performed to form a primer layer by applying a primer to the base surface.

The above aggregates may be added to form the skeleton of the packing layer and to improve strength and durability. As the aggregate, new aggregates may be used alone, or new aggregates and recycled aggregates may be used together, and the type of rock used as the aggregate is not particularly limited.

As the above aggregates, coarse aggregates and fine aggregates may preferably be used together, and 40 to 75 wt% of coarse aggregates and 25 to 60 wt% of fine aggregates may be used. Coarse aggregates refer to aggregates that do not pass through a 5 mm sieve and remain, and fine aggregates refer to aggregates that pass through a 5 mm sieve, and the maximum particle size of the coarse aggregates used may be 27 mm. The particle size refers to the largest length among the cross-sectional diameters of the particles.

The ratio of coarse aggregate and fine aggregate included in the above aggregate may vary depending on the thickness of the pavement layer. As the thickness of the pavement layer increases, the ratio of coarse aggregate may increase and the ratio of fine aggregate may decrease. For example, when the thickness of the pavement layer is 5 cm, 50 to 75 wt% of coarse aggregate and the remainder of fine aggregate may be used, and when the thickness of the pavement layer is 4 cm, 40 to 65 wt% of coarse aggregate and the remainder of fine aggregate may be used.

The above asphalt is used for binding aggregate and raw material components, and at least one or more of natural asphalt such as lake asphalt, rock asphalt, sand asphalt, and asphaltite; and petroleum asphalt such as straight asphalt, cutback asphalt, emulsified asphalt, blown asphalt, and modified asphalt can be used.

Asphalt may be included in an amount of 5 to 30 parts by weight per 100 parts by weight of aggregate. If the asphalt content is less than the above range, sufficient bonding may not occur, which may result in problems such as aggregate detachment, peeling of the pavement layer, and cracking. On the other hand, if the asphalt is included excessively beyond the above content range, problems such as reduced durability and strength of the pavement layer may occur. Therefore, it is preferable that the asphalt be included within the above-mentioned weight range.

The above-mentioned snow removal additive is a substance added to the asphalt pavement to suppress the formation of an ice layer on top of the asphalt pavement and to provide the asphalt pavement with the function of melting an already formed ice layer. The snow removal additive may include at least one of an environmentally friendly snow removal agent capsule and waste tire rubber.

The above snow removal additive may be included in an amount of 1 to 19 parts by weight per 100 parts by weight of aggregate. When the snow removal additive is included within the above weight range, the snow melting functions such as freezing prevention and ice layer removal are most effectively exhibited. Therefore, it is preferable to add it within the above-mentioned weight range.

Among the above-mentioned snow removal additives, eco-friendly snow removal capsules can be added to chemically suppress the formation of ice layers. When the eco-friendly snow removal capsules receive moisture from dew or frost in the morning in winter or snow accumulated during snowfall, they perform the function of suppressing the formation of ice by lowering the freezing point of water through the action of water-soluble eco-friendly snow removal agents.

These eco-friendly de-icing agent capsules include a core containing an eco-friendly de-icing agent; and a capsule layer encapsulating the core.

Since the core containing the eco-friendly deicing agent has a structure in which it is encapsulated by a capsule layer composed of a polymer as described below, substances of various compositions can be preserved in a stable form within the capsule, and when necessary, a suitable reaction required according to road conditions can be induced, thereby implementing slow-release characteristics in which the deicing agent contained within the core slowly reacts with moisture in snow or black ice.

For such encapsulation, interfacial polymerization, in-situ polymerization, polymer phase separation (coacervation), spraying, and coating methods can be applied, and as a polymerizable polymer for forming a capsule layer, at least one or more of acrylate, styrene, ethylene, lactate, and polyethylene glycol-polystyrene can be used, but is not limited thereto, and preferably acrylate can be used. Here, the polymerizable polymer means a material capable of at least one or more reactions among polymerization, cross-linking, and self-assembly. In addition, depending on the type of polymerizable polymer, at least one or more of water, hexane, toluene, ethanol, methanol, and chloroform can be appropriately selected and used as the solvent used during polymerization.

The above core contains a deicing agent, and the core is encapsulated by a capsule layer to form a deicing agent capsule. Since the deicing agent is encapsulated in this way, when it rains or snows or when moisture exists on the road surface, the deicing agent is not rapidly dissolved and consumed in a short period of time, but can be gradually dissolved in a certain amount over a long period of time, so that the deicing agent capsule's snow removal and black ice prevention effects can be implemented for a long period of time.

The eco-friendly deicing agent included in the above core may include at least one of calcium magnesium acetate, potassium acetate, sodium acetate, potassium formate, sodium formate, ethylene glycol, and propylene glycol. This deicing agent is an eco-friendly deicing agent that does not contain chloride, and can prevent problems such as environmental pollution caused by chloride, road damage or corrosion, and vehicle corrosion, so it has the advantage of being eco-friendly and easy to use. This eco-friendly deicing agent capsule will be described in more detail later.

Among the above snow removal additives, waste tire rubber is added to implement the CRM (crumb rubber modified) method, and can remove the ice layer by a physical method, thereby improving the anti-icing performance of the eco-friendly snow removal agent capsule. Specifically, the addition of waste tire rubber increases the elasticity of the asphalt pavement layer, so that the deformation of the road caused by the load of the vehicle when the vehicle passes promotes the crushing of the ice layer, and accordingly, the area of the exposed road surface increases, so that the anti-icing performance of the eco-friendly snow removal agent capsule can be effectively implemented.

In addition, since the waste tire rubber particles are exposed and protruded on the road surface, the slip resistance of the road surface is improved, wear resistance is high, and noise can be reduced when the vehicle is driven. In addition, by using waste tire rubber obtained by processing waste tires rather than new rubber particles, the cost of waste tire disposal can be reduced, and environmental pollution caused by waste tire disposal can be prevented, so there is an environmentally friendly advantage.

The above waste tire rubber is a powdery substance obtained by processing waste tires, and may have an average particle size of 1 to 20 mm and a maximum particle size of 10 to 20 mm. In particular, since durability is better when the maximum particle size is 14 to 20 mm, it is most preferable to use waste tire rubber having such a particle size.

Meanwhile, as described above, at least one of an eco-friendly deicing agent capsule and waste tire rubber may be included as a snow removal additive, and when both an eco-friendly deicing agent capsule and waste tire rubber are included, 4 to 12 parts by weight of the eco-friendly deicing agent capsule and 1 to 7 parts by weight of the waste tire rubber may be included as a snow removal additive per 100 parts by weight of the aggregate.

If the content of the eco-friendly deicing agent capsules is less than the above range, it is difficult to obtain an anti-freezing effect through freezing point lowering, and if it is included in excess of the above weight range, there is a concern that the strength or durability of the road may be reduced.

In the case of waste tire rubber, if it is included below the above range, the effect of increasing the elasticity of the road by the waste tire rubber is minimal, making it difficult to obtain the effect of physically removing the ice layer and inhibiting freezing, and if it is included exceeding the above weight range, the elasticity of the road may increase excessively, causing a decrease in the durability and strength of the road, so it is preferable to include it within the above-mentioned weight range.

Asphalt mixtures containing these components have excellent strength and durability, and can prevent freezing and remove ice layers through snow removal additives, so they can prevent accidents caused by freezing in winter. Since environmentally friendly snow removal agents that do not contain chloride as chemical snow removal additives are used, they are environmentally friendly and have the advantage of preventing corrosion or damage to roads and corrosion of vehicles.

Next, a curing step is performed to cure the above-mentioned packing layer to form a snow-melting packing layer, and the curing can be performed by a conventional method. Through this process, a snow-melting packing layer with a thickness of about 4 to 5 cm can be finally formed.

Before this curing step, a compaction step for compacting the pavement layer may be additionally performed. Compaction may be performed using compaction equipment such as a road roller, a vibrating roller, a tandem roller, a macadam roller, or a tire roller, and the number of compactions, the type of equipment, and the compaction thickness may be appropriately adjusted depending on the natural environment or weather conditions around the road where construction is to be done.

In addition, between the compaction step and the curing step, a hard aggregate spraying step may be additionally performed to additionally spray hard aggregate on top of the pavement layer for additional slip prevention. As the hard aggregate, emery, glass beads, aluminum oxide, silicon dioxide, silica, etc. may be used, and any hard aggregate that can be used for slip prevention may be used without limitation thereto.

The snow melting pavement layer formed in this way has the advantage of ensuring safety when driving or walking in winter, as it can obtain the effects of ice suppression and ice layer removal by snow removal additives. In addition, since the road itself has the effects of ice suppression and snow melting, it can reduce the number of times snow removal agents are sprayed, preventing environmental pollution caused by snow removal agent spraying, and reducing manpower and energy use.

Meanwhile, as described above, the eco-friendly de-icing agent capsule among the above-mentioned snow removal additives includes a core including an eco-friendly de-icing agent; and a capsule layer encapsulating the core.

The core contains a deicing agent, and the core is encapsulated by a capsule layer to form a deicing agent capsule. The environmentally friendly deicing agent contained in the core may contain at least one of calcium magnesium acetate, potassium acetate, sodium acetate, potassium formate, sodium formate, ethylene glycol, and propylene glycol.

The core may be composed solely of an eco-friendly deicing agent, or may be a porous material impregnated with an eco-friendly deicing agent. If the core is composed solely of an eco-friendly deicing agent, it has the advantage of quickly showing black ice prevention or initial snow removal effects when snow falls, and if the core is a porous material impregnated with an eco-friendly deicing agent, it has the advantage of maintaining the road's anti-icing life for a long time.

In this way, when using a porous material impregnated with an eco-friendly deicing agent as a core, the porous material may be zeolite and/or diatomaceous earth. Here, “impregnation” may be a broad term that includes everything from a narrow meaning in which the internal pores of the porous material are impregnated with a deicing agent, to a broad meaning in which at least a portion of the porous material is coated with a deicing agent.

In the case of a core impregnated with an eco-friendly deicing agent in a porous material, the porous material can be immersed in an eco-friendly deicing agent aqueous solution in which the eco-friendly deicing agent is dissolved in water, the porous material is taken out, and then dried. Alternatively, the porous material can be heated while the eco-friendly deicing agent aqueous solution is repeatedly sprayed onto the porous material, and then dried. This core manufacturing method will be described in more detail later.

The above capsule layer can be formed through a polymerization reaction of a polymerizable polymer and an initiator. The capsule layer can encapsulate by coating at least a portion of the surface of the core. Since the capsule layer is water-soluble, the capsule layer can be dissolved by moisture such as frost or snow, or the moisture can pass through the capsule layer and release the eco-friendly deicing agent inside the capsule to the outside, thereby slowly and continuously maintaining the deicing effect for a long period of time.

The above capsule layer can be formed by polymerizing a polymerizable polymer and an initiator under a solvent, and can react with the core to form a capsule shape. At this time, for effective formation of the capsule layer, it is preferable that the eco-friendly de-icing agent included in the core material is used in an amount of up to 50 parts by weight based on 100 parts by weight of the polymerizable polymer and the initiator, which are capsule layer materials. In particular, the content of the eco-friendly de-icing agent can be used in an amount of 5 to 50 parts by weight, preferably 5 to 30 parts by weight or 10 to 20 parts by weight based on 100 parts by weight of the polymerizable polymer and the initiator.

As an example, the polymerizable polymer is acrylic acid and an acrylic crosslinker, and the solvent is water. However, the types of polymerizable polymer and solvent are not limited to this.

For example, when the core is composed solely of an eco-friendly deicer, an eco-friendly deicer capsule can be manufactured by mixing and reacting 9 to 39 wt% of an eco-friendly deicer as the core, 10 to 35 wt% of acrylic acid, 0.1 to 0.5 wt% of an acrylic crosslinking agent, 0.1 to 0.5 wt% of an initiator, and 50 to 80 wt% of water.

As another example, when the core is a porous material impregnated with a deicer, a capsule layer can be formed by mixing and reacting 9 to 35 wt% of the core, 8 to 30 wt% of acrylic acid, 0.1 to 0.5 wt% of an acrylic crosslinker, 0.1 to 0.5 wt% of an initiator, and 55 to 82 wt% of water.

Acrylic acid is a major polymer material forming the capsule layer, and when included within the weight range described above, it can sufficiently encapsulate the core while realizing stable physical properties of the capsule layer.

The acrylic crosslinking agent can improve the properties and durability of the capsule layer by crosslinking the acrylic acids with each other. If it is included in an amount less than the weight range described above, the effect of improving the properties by crosslinking is minimal. If it is included in an amount exceeding the weight range described above, encapsulation does not proceed stably and the hardness of the capsule layer may excessively increase. Therefore, it is preferable to include it within the weight range described above.

Specific acrylic crosslinking agents include, for example, at least one selected from the group consisting of polyethylene glycol diacrylate (PEGDA), 1,6-hexanediol acrylate (HDDA), ethylene glycol dimethacrylate, diethylene glycol diacrylate, triethylene glycol dimethacrylate, and N,N′-methylenebisacrylamide. However, any acrylic crosslinking agent may be used without particular limitation.

The initiator is a substance that initiates the polymerization reaction of acrylic acid and an acrylic crosslinking agent, and examples thereof include, but are not limited to, potassium persulfate.

The above-mentioned eco-friendly de-icing agent capsule can be manufactured by the following method. Specifically, it can be manufactured through a core preparation step of preparing a core containing an eco-friendly de-icing agent; an encapsulation step of reacting the core with a polymerizable polymer and an initiator to encapsulate it; and an eco-friendly de-icing agent manufacturing step of drying and pulverizing the capsule manufactured through the encapsulation step.

At this time, the eco-friendly deicing agent may include at least one of calcium magnesium acetate, potassium acetate, sodium acetate, potassium formate, sodium formate, ethylene glycol, and propylene glycol.

First, the core preparation step is a step of preparing a core containing an eco-friendly de-icing agent. Here, the core may be made of an eco-friendly de-icing agent, or may be a porous material impregnated with an eco-friendly de-icing agent.

For example, if the core is made of an eco-friendly de-icing agent, the core preparation step may be a step of preparing an eco-friendly de-icing agent.

As another example, when a porous material impregnated with a deicing agent is used as a core, the core preparation step may be a step of impregnating the porous material with an eco-friendly deicing agent aqueous solution and then drying it to manufacture a porous core impregnated with an eco-friendly deicing agent.

In this case, the specific core preparation steps may include an impregnation step of immersing the porous material in an eco-friendly deicing agent solution or spraying the eco-friendly deicing agent solution onto the porous material to impregnate the porous material with the eco-friendly deicing agent solution; a drying step of drying the porous material impregnated with the eco-friendly deicing agent solution.

The above impregnation step may be a step of immersing the porous material in an eco-friendly de-icing agent solution, or a step of spraying the eco-friendly de-icing agent solution onto the porous material to impregnate the porous material with the eco-friendly de-icing agent solution.

For example, when the impregnation step is performed by an immersion method, the impregnation step can be performed by mixing and stirring water, a porous material, and an eco-friendly deicing agent, and then obtaining a porous material impregnated with the eco-friendly deicing agent through filtration. The order of mixing is not particularly limited, and for example, the impregnation step can be performed by immersing the porous material in water to allow water to penetrate into the pores of the porous material, and then adding the eco-friendly deicing agent thereto and stirring, or as another example, the impregnation step can be performed by immersing the porous material in an eco-friendly deicing agent solution mixed with an eco-friendly deicing agent and water and stirring.

When the impregnation step is performed by immersion as described above, it can be performed by mixing an eco-friendly de-icing agent into a mixture of a porous material and water, and the composition at this time can be configured to mix 6 to 30 wt% of the porous material, 3 to 30 wt% of the eco-friendly de-icing agent, and the remainder of water.

As another example, when the impregnation step is performed by spraying, the impregnation step can be performed by spraying an eco-friendly de-icing agent aqueous solution onto the porous material. In this step as well, as in the immersion method, an aqueous solution containing water and an eco-friendly de-icing agent can be sprayed onto the porous material, and at this time, 6 to 30 wt% of the porous material, 3 to 30 wt% of the eco-friendly de-icing agent, and the remainder of water can be used.

At this time, it is desirable that the porous material is continuously heated to 50 to 120℃. In this case, the moisture in the sprayed eco-friendly deicing agent solution dries quickly, so the eco-friendly deicing agent impregnation efficiency increases, and the process time of the subsequent drying step can be shortened.

In addition, the porous material can be subjected to continuous or intermittent stirring at this stage. For example, the porous material can be spread on a heated vibrating plate and sprayed with intermittent or continuous vibration while heating. This has the advantage of allowing the environmentally friendly deicing agent to be uniformly impregnated over the entire surface of the porous material.

Meanwhile, the drying step may be a step of drying the porous material impregnated with the eco-friendly deicing agent aqueous solution. The drying may be performed to a degree where moisture does not leak out from the porous material impregnated with the eco-friendly deicing agent aqueous solution or to a degree slightly more dry than that. The drying temperature may be 95 to 120°C, and the drying time may be appropriately set until the porous material is dried to the degree described above.

Next, the encapsulation step is a step of encapsulating by reacting the core with a polymerizable polymer and an initiator. When acrylic acid and an acrylic crosslinking agent are used as the polymerizable polymer, this may be a step of encapsulating by polymerizing the core, acrylic acid, an acrylic crosslinking agent, and an initiator at 70 to 90° C. for 1 to 6 hours. At least a part of the raw material composition may be changed in this step depending on the type of the core.

Specifically, in the case where the core is composed solely of an eco-friendly deicing agent, the reaction may be a step of reacting 9 to 39 wt% of the eco-friendly deicing agent, 10.1 to 35.5 wt% of the polymerizable polymer, 0.1 to 0.5 wt% of the initiator, and 50 to 80 wt% of water. At this time, when acrylic acid and an acrylic crosslinking agent are used as the polymerizable polymer, the reaction may be performed in a weight range of 10 to 35 wt% of the acrylic acid and 0.1 to 0.5 wt% of the crosslinking agent.

In addition, when the core is a porous material impregnated with a deicer, it can be a step of reacting 9 to 35 wt% of the core, 8.1 to 30.5 wt% of the polymerizable polymer, 0.1 to 0.5 wt% of the initiator, and 55 to 82 wt% of water. When acrylic acid and an acrylic crosslinking agent are used as the polymerizable polymer, the reaction can be performed in a weight range of 8 to 30 wt% of acrylic acid and 0.1 to 0.5 wt% of the crosslinking agent.

Through this step, a gel-shaped composite, which is an encapsulation, in which a core is dispersed inside an acrylic polymer can be obtained. When a gel-shaped composite is obtained in the encapsulation step, it is judged that encapsulation has been performed, and an aging process can be performed to further promote the reaction for 1 to 5 hours. This polymerization reaction can be performed under an inert gas to suppress side reactions with oxygen, and nitrogen, helium, argon, etc. can be used as the inert gas.

Lastly, the eco-friendly de-icing agent capsule manufacturing step is a step of manufacturing an eco-friendly de-icing agent capsule by drying and crushing the capsule manufactured through the encapsulation step. To this end, a step of filtering the mixture containing the capsule manufactured through the encapsulation step to remove the remaining water may be performed first.

Next, a step of drying and crushing the filtered encapsulated substance to manufacture an environmentally friendly de-icing agent capsule in powder form is performed. At this time, drying can be performed until the encapsulated substance becomes a solid phase rather than a gel phase, and for example, drying can be performed at 80 to 110°C for 2 to 10 hours.

The method of pulverization is not particularly limited, and pulverization can be performed so that the size of the pulverized particles is at the micro level. For example, pulverization can be performed so as to be 10 to 500 μm, and the particle size can be selected through sieving if necessary.

Through this manufacturing method, an eco-friendly de-icing agent capsule can be manufactured in which a core is encapsulated by a capsule layer, and this eco-friendly de-icing agent capsule can be mixed with asphalt or concrete and used in the construction of pavement having an anti-icing function.

The above eco-friendly deicing agent capsules have a form in which the deicing agent is positioned in the core and the core is encapsulated by a water-soluble capsule layer, so that when moisture exists on the road, the deicing agent is dissolved to prevent freezing on the road. In addition, since the deicing agent is prevented from being dissolved in a short period of time by the capsule, there is an advantage in that the deicing-inhibiting function of the road can be maintained for a long period of time.

The above asphalt mixture may contain 5 to 40 parts by weight of an environmentally friendly deicing agent capsule per 100 parts by weight of asphalt, and may additionally contain 1 to 10 parts by weight of modified sulfur per 100 parts by weight of asphalt, if necessary.

The above-mentioned eco-friendly deicing agent capsules, when included within the weight range described above, can obtain an anti-icing effect without causing a deterioration in the bonding strength or physical properties of the pavement. More preferably, 20 to 40 parts by weight of the eco-friendly deicing agent capsules can be included with respect to 100 parts by weight of asphalt, and in this case, an anti-icing effect can be obtained for about 3 hours or more, and an average of 5 and a half hours.

Meanwhile, the asphalt mixture may further contain 3 to 9 parts by weight of modified sulfur per 100 parts by weight of the aggregate, if necessary. The modified sulfur is added to improve the bonding strength of the pavement layer, and may be sulfur modified with a dicyclo pentadiene-based modifier and a heterocyclic amine compound. Specifically, 100 parts by weight of sulfur may be modified with 0.1 to 100 parts by weight of a dicyclo pentadiene-based modifier and 0.01 to 200 parts by weight of a heterocyclic amine compound, and may have a liquid or solid phase.

The above sulfur is a typical sulfur group, and such sulfur may include natural sulfur or sulfur produced by desulfurization of petroleum or natural gas, and may be molten sulfur obtained by heating and melting sulfur at 120°C or higher, preferably 125 to 140°C.

As the above dicyclopentadiene-based modifier, dicyclopentadiene may be used alone, or a dicyclopentadiene mixture in which at least one of cyclopentadiene, a dicyclopentadiene derivative, and a cyclopentadiene derivative is added to dicyclopentadiene may be used, and a mixture in which at least one of dipentene, vinyl toluene, styrene monomer, and dicyclopentene is added to dicyclopentadiene or the dicyclopentadiene mixture may be used. As the cyclopentadiene derivative, at least one of methyl cyclopentadiene and methyl dicyclo pentadiene may be used, but is not limited thereto.

As an exemplary composition of such a dicyclo pentadiene-based modifier, a composition including about 65 to 75 wt% of dicyclo pentadiene, about 10 to 20 wt% of cyclo pentadiene, about 10 to 20 wt% of derivatives thereof (methyl cyclo pentadiene, methyl dicyclo pentadiene, etc.), and about 0.1 to 1.5 wt% of other components can be presented.

The above dicyclo pentadiene-based modifier preferably has a dicyclo pentadiene content of about 70 wt% or more (referred to as “70% purity”), and most commercially available products released under the name of dicyclo pentadiene can be used as the dicyclo pentadiene-based modifier of the present invention.

The above dicyclopentadiene-based modifier can be added in an amount of 0.1 to 100 parts by weight, and preferably 1 to 70 parts by weight, per 100 parts by weight of sulfur. When a dicyclopentadiene-based modifier is used in conventional sulfur modification, the more dicyclopentadiene is added, the more likely it is that the viscosity will increase as the reaction progresses and the resulting damage to the reaction tank will occur. Therefore, it is common to use the dicyclopentadiene-based modifier in an amount of up to about 30 parts by weight. However, in the present invention, since the modified sulfur is manufactured and used in a liquid state in the case of low viscosity and in a solid state in the case of high viscosity, it is possible to use the dicyclopentadiene-based modifier in a high content as described above.

In particular, since an amine compound that functions as a reaction inhibitor or viscosity regulator is used together, not only can problems in the synthesis process be prevented unlike conventional technologies, but also, by using heterocyclic amines together, a property of remelting at a temperature of 100℃ or lower, which did not appear in conventional modified sulfur, can be exhibited.

The above amine compound may be an alkylamine or a heterocyclic amine.

As the above alkylamine, for example, at least one or more of methylamine, ethylamine, n-propylamine, iso-propylamine, n-butylamine, iso-butylamine, sec-butylamine, n-amylamine, iso-amylamine, n-hexylamine, 2-aminohexane, isohexylamine, 3,3-dimethyl-2-butanamine, 2-amino-4-methylpentane, 3,3-dimethylbutylamine, 3,3-dimethyl-2-butylamine, 1-amino-2-ethyl-n-butane, and 3-amino-3-methylpentane can be used, but is not limited thereto.

The above heterocyclic amine compound may be at least one selected from the group consisting of pyridine, homologues of pyridine, isomers of pyridine, isomers of homologues of pyridine, quinoline, isoquinoline, acridine, and pyrrole.

Pyridine exists in large quantities in the crude oil of coal tar together with its homologues picoline and lutidine, and is an industrially produced heterocyclic compound from its homologue pyridine base. Pyridine is a colorless liquid with a bad odor, and has a molecular weight of 79.10, a melting point of -42℃, a boiling point of 115.5℃, and a specific gravity of 0.9779 (25℃). Its derivatives are synthesized by the Hantzsch synthesis, and pyridine derivatives include various pyridine carboxylic acids, pyridine sulfonic acids, and pyridine aldehyde.

Picoline, which has properties almost similar to pyridine, is also called methyl pyridine, and exists in three types of isomers (2-methylpyridine, 3-methylpyridine, and 4-methylpyridine) depending on the position of the methyl group. Lutidine has six types of isomers, including (2,3), (2,4), (2,5), (2,6), (3,4), and (3,5), and the heterocyclic amines used in the present invention are not limited to the substances listed above.

Meanwhile, heterocyclic amines can be added in an amount of 0.01 to 200 parts by weight, preferably 0.01 to 100 parts by weight, per 100 parts by weight of sulfur.

The above modified sulfur can be manufactured by mixing raw materials in various orders and performing processes such as heat treatment or cooling to secure the properties of the final product.

For example, liquid modified sulfur can be produced by mixing sulfur and a dicyclopentadiene-based modifier, heating and reacting them, then adding a heterocyclic amine compound and performing a heat treatment.

For example, a liquid modified sulfur can be produced by mixing a dicyclopentadiene-based modifier and a heterocyclic amine compound, adding sulfur, and then performing a heat treatment.

For example, liquid modified sulfur can be produced by mixing sulfur and a heterocyclic amine compound, heating to react, then adding a dicyclopentadiene-based modifier and performing a heat treatment.

For example, sulfur and a dicyclopentadiene-based modifier are mixed, heated and reacted, then cooled to produce a solid reactant, and the solid reactant is remelted, a heterocyclic amine compound is added thereto, and then heat-treated to produce a liquid modified sulfur.

When the heterocyclic amine compound added during the manufacture of the above modified sulfur is included in an amount of about 5 parts by weight or more per 100 parts by weight of sulfur, a characteristic sulfur-like odor is present, so it is desirable to vaporize it, and through such vaporization, the overall properties of the modified sulfur can be further stabilized.

It is preferable that the vaporization be performed near the point in time when the modified sulfur precursor starts to be generated, and this point in time can be when the viscosity is maintained in the range of 0.01 to 100.0 Pa·s, preferably 0.1 to 10.0 Pa·s. In this case, in order to more accurately measure the point in time when the modified sulfur precursor starts to be generated, analyzing the molecular weight distribution by GPC measurement can make it easier and more accurate to determine the point in time, but if the reaction is continuously progressing, there is the hassle of having to perform periodic measurements, so it is convenient to measure in real time by equipping a device such as a Haki viscometer.

Modified sulfur manufactured in this way can be melted at a temperature of 100℃ or less, and can also be melted at about 60℃, so it is easy to use. In particular, when mixed with molten asphalt for mixing with asphalt, the solid modified sulfur can also be re-melted and easily mixed with asphalt.

When modified sulfur is additionally added, the modified sulfur may be included in an amount of 3 to 9 parts by weight per 100 parts by weight of aggregate. However, when the content of modified sulfur is less than the above range, it is difficult to obtain the effects of improved bonding strength and improved physical properties of the pavement layer due to modified sulfur, and when it exceeds the above range, the physical properties of the pavement layer may rather deteriorate, and workability may be deteriorated due to excessive increase in viscosity. Therefore, it is preferable that it be included within the weight range described above.

In addition, additional additives may be included in the asphalt mixture as needed, including but not limited to polymer binders, pigments, process oils, etc.

Hereinafter, the specific operation and effect of the present invention will be explained through an embodiment of the present invention. However, this is presented as a preferred example of the present invention, and the scope of the rights of the present invention is not limited according to the embodiment.

[Manufacturing Example 1]

To evaluate whether the encapsulation reaction was in progress, a core material was prepared, and 20 g of the core, 19.6 g of acrylic acid, 0.2 g of PEGDA as a crosslinking agent, 0.2 g of potassium persulfate as an initiator, and 60 g of water were mixed, then the temperature was raised to 75±2°C, stirred, and polymerized for 1 hour. After an aging reaction for 2 more hours, the polymerization reaction was terminated, and the encapsulation reaction was performed.

As cores, eco-friendly deicing agents such as calcium magnesium acetate (CMA) and sodium formate (SF) were prepared, and as general commercial deicing agents, Bulgasari (ECO-ST1, Star Tech Co., Ltd.) and sodium chloride were prepared.

[Manufacturing Example 2]

To evaluate whether the encapsulation reaction was in progress, a core material was prepared, and 20 g of the core, 19.4 g of acrylic acid, 0.3 g of PEGDA as a crosslinking agent, 0.3 g of potassium persulfate as an initiator, and 60 g of water were mixed, then the temperature was raised to 75±2°C, stirred, and polymerized for 1 hour. After an aging reaction for 2 more hours, the polymerization reaction was terminated, and the encapsulation reaction was performed.

The core used was an eco-friendly de-icing agent impregnated into a porous material as used in Manufacturing Example 1, and this core material was manufactured using two methods: immersion and spraying.

Specifically, the immersion method involved adding 16 g of diatomaceous earth to 70 g of water and stirring at 80°C for 30 minutes, adding 14 g of a deicer to the mixture and stirring at the same temperature for 2 hours, then filtering the deicer-impregnated diatomaceous earth and drying it at 103°C for 2 hours.

In addition, the spray method was used, in which 16 g of diatomaceous earth was spread on a 103℃ hot plate, a deicing agent solution containing 70 g of water and 14 g of deicing agent was completely mixed, sprayed onto all of the diatomaceous earth, and then further dried until the moisture was removed.

The encapsulated materials in Table 1 were manufactured through Manufacturing Examples 1 and 2.

　 Core Types of snow removers Sample 1 Snow removal agent only CMA Sample 2 Snow removal agent only SF Sample 3 Snow removal agent only starfish Sample 4 Snow removal agent only Sodium chloride Sample 5 Diatomaceous earth impregnated with snow melting agent (immersion method) CMA Sample 6 Diatomaceous earth impregnated with snow melting agent (immersion method) SF Sample 7 Diatomaceous earth impregnated with snow melting agent (immersion method) starfish Sample 8 Diatomaceous earth impregnated with snow melting agent (immersion method) Sodium chloride Sample 9 Diatomaceous earth impregnated with snow melting agent (spray method) CMA Sample 10 Diatomaceous earth impregnated with snow melting agent (spray method) SF Sample 11 Diatomaceous earth impregnated with snow melting agent (spray method) starfish Sample 12 Diatomaceous earth impregnated with snow melting agent (spray method) Sodium chloride

[Experimental Example 1]

The progress of encapsulation of Samples 1 to 4 manufactured by the method of Manufacturing Example 1 was evaluated, and the amount of eco-friendly deicing agent used relative to 100 parts by weight of the total content of capsule layer materials (acrylic acid, crosslinking agent, and initiator) was changed, and the progress of encapsulation was evaluated accordingly, and the results are shown in Table 2. The progress of encapsulation was evaluated as progressing if the mixture changed into a gel form after polymerization and aging, and as not progressing if it did not change into a gel form. In addition, the core content in Table 2 means the weight ratio relative to 100 parts by weight of the capsule layer material, and an experimental result photograph when the core content was 20 parts by weight was additionally attached to Fig. 1.

　 Whether encapsulation is in progress Core content (by weight) 20 50 75 100 Sample 1 ○ ○ ○ △ Sample 2 ○ ○ × × Sample 3 ○ ○ ○ ○ Sample 4 ○ ○ ○ ○

As a result of the experiment, when an eco-friendly deicing agent was used as a core, it was confirmed that encapsulation was performed when the eco-friendly deicing agent was used in an amount of 50 parts by weight or less per 100 parts by weight of the capsule layer material, regardless of the type of deicing agent. Therefore, it was confirmed that it is desirable to use a maximum of 50 parts by weight of the deicing agent per 100 parts by weight of the capsule layer material in order to ensure stable encapsulation of the deicing agent.

[Experimental Example 2]

The progress of encapsulation of samples 5 to 12 manufactured by the method of Manufacturing Example 2 was evaluated, and the amount of eco-friendly deicing agent used relative to 100 parts by weight of the total content of capsule layer materials (acrylic acid, crosslinking agent, and initiator) was changed, and the progress of encapsulation was evaluated accordingly, and the results are shown in Table 3. In Table 3, the deicing agent content means the weight ratio relative to 100 parts by weight of the total content of capsule layer materials.

Specifically, the composition of the reactants in the encapsulation reaction was fixed to the composition described in Manufacturing Example 2, and the concentration of the aqueous snow removal agent solution used in the core manufacture was changed to evaluate whether the encapsulation progressed when the content of the eco-friendly snow removal agent was changed to 20, 50, 75, and 100 parts by weight relative to the total content of 100 parts by weight of the capsule layer materials (acrylic acid, crosslinking agent, and initiator).

In addition, experimental results for samples 4 to 8 with a core content of 20 parts by weight are attached to Fig. 2, and for samples 9 to 12, porous materials impregnated with a deicer are photographed and shown in Fig. 3.

　 Whether encapsulation is in progress Snow melting agent content (weight parts) 20 50 75 100 Sample 5 ○ ○ ○ × Sample 6 ○ ○ × × Sample 7 ○ ○ × × Sample 8 ○ ○ × × Sample 9 ○ ○ ○ △ Sample 10 ○ ○ × × Sample 11 ○ ○ × × Sample 12 ○ ○ × ×

As a result of the experiment, it was confirmed that encapsulation was achieved when the eco-friendly deicing agent was used in an amount of 50 parts by weight or less per 100 parts by weight of the capsule layer material, regardless of the type of deicing agent or the type of porous material. Therefore, it was confirmed that it is desirable to use an eco-friendly deicing agent in an amount of up to 50 parts by weight per 100 parts by weight of the capsule layer material in order to achieve stable encapsulation of the deicing agent.

[Experimental Example 3]

Samples 13 to 15, which are porous materials impregnated with deicer by the immersion method, were manufactured by changing the type of porous material and the type of eco-friendly deicer. At this time, 100 g of porous material and 20 g of eco-friendly deicer were used. Thereafter, the initial weight of each sample was measured, and after being completely immersed in water for 1 minute, they were taken out and dried at 120℃ for 1 hour and 20 minutes. The weight after drying, which is the weight before and after the experiment, was measured as the percentage of the weight after drying to the initial weight, and the results are shown in Table 4. The immersion experiment was performed three times for each sample, and the weight loss rate was calculated for each time.

　 porous material Snow removal agent 1st time
Loss rate 2nd time
Loss rate 3rd time
Loss rate Sample 13 Zeolite SF 8 4 2 Sample 14 Zeolite CMA 3.4 2.7 0.5 Sample 15 Diatomaceous earth CMA 1.1 0.3 0.1

This experiment was conducted to evaluate the dissolution characteristics of a deicer, and through this experiment, it was confirmed that the dissolution characteristics of a deicer change depending on the type of porous material and deicer. It was found that the reduction rate decreased as the number of experimental times increased, and the reduction rate of CMA was lower than that of SF, confirming that CMA is a more desirable deicer in terms of sustainability, and in particular, the combination of diatomaceous earth and CMA was confirmed to be the most desirable.

[Experimental Example 4]

An acrylic polymer was prepared by mixing only acrylic acid, a crosslinker, an initiator, and water without using a core material, and then a thermogravimetric analysis (TGA) was performed, and the results are shown in Fig. 4.

Referring to the TGA analysis results of Fig. 4, it was confirmed that the acrylic polymer had high thermal stability as there was almost no weight loss up to 250℃, and it is judged that the weight loss was due to moisture. Therefore, it was found that the acrylic polymer used in the capsule layer of the present invention had high thermal stability, so that the stability of the deicing agent capsule was secured even when used mixed with asphalt or concrete during road paving.

[Experimental Example 5]

Samples 5 to 12 containing 20 parts by weight of core per 100 parts by weight of capsule layer were manufactured, the manufactured gel-type capsules were filtered and dried at 100°C for 5 hours, the dried encapsulated material was pulverized to manufacture environmentally friendly deicing capsules of about 30 to 110 μm, these were mixed with asphalt to manufacture asphalt pavement, and then their anti-icing performance was evaluated.

Specifically, 100 g of asphalt was heated to 180°C to melt it, 5 g of modified sulfur and 5 to 40 g of deicing agent capsules were mixed, the mixture was applied to the concrete surface, and cured at room temperature for 2 hours. After that, the cured pavement was maintained at -4 to -7°C for 24 hours, and 30 ml of water was prepared and sprayed on the asphalt surface, and the time for the water to freeze was measured, which is recorded in Table 5.

　 Freezing time (hours) Snow melting agent capsule content (weight parts) 5 10 20 40 Sample 5 within 5 minutes within 1 hour 4 7 Sample 6 3 4 Sample 7 2 4.5 Sample 8 2.5 5 Sample 9 within 1 hour 4 6 9 Sample 10 3 4.5 6 Sample 11 2 3 7 Sample 12 3.5 4 7.5

As a result of the experiment, it was confirmed that as the content of the deicing agent capsules per 100 parts by weight of asphalt increased, the freezing time of the water sprayed on the asphalt pavement was delayed. In addition, it was found that the anti-freezing performance was better when the deicing agent-impregnated porous material was manufactured by spraying than by immersion, and it was found that the anti-freezing performance was further improved when CMA or SF was used as the deicing agent.

[Experimental Example 6]

In order to evaluate the dissolution characteristics of core materials through encapsulation, deicing agents that can measure chloride concentration, such as bulgasari, sodium chloride, and calcium chloride, were prepared, and they were encapsulated using the same method as in Manufacturing Example 1. Next, beakers containing the same amount of water were prepared, and each deicing agent was divided into raw materials and capsules and added to each beaker to make a total of six solutions, and the chloride dissolution amount over time was measured, which is shown in Table 6.

Snow removal agent Whether or not it is encapsulated 1 day 7 days 14 days 21 days 28th starfish Raw materials 1.125% 1.134% 1.127% 1.148% 1.149% capsule 0.963% 0.977% 0.981% 0.984% 1.032% Sodium chloride Raw materials 1.090% 1.115% 1.095% 1.092% 1.115% capsule 0.849% 0.987% 1.001% 1.011% 1.039% Calcium chloride Raw materials 0.911% 0.917% 0.910% 0.916% 0.911% capsule 0.740% 0.810% 0.815% 0.839% 0.869%

As a result of the experiment, in the case of raw materials, the chloride concentration was found to be almost constant over time. In reality, the chloride concentration increased slightly, which is considered to be due to the effect of moisture evaporation. On the other hand, in the case of capsule-type deicing agents, the initial chloride concentration was low, but it increased over time, indicating that the deicing agent in the capsule layer was gradually dissolved over time, and even after 28 days, it was confirmed that the amount of dissolved was still less than that of the raw materials.

Meanwhile, the same experiment was performed using CMA and SF, which are eco-friendly deicing agents, respectively, but no chloride was detected.

Therefore, through this experiment, it was confirmed that it is desirable to encapsulate the deicing agent in a capsule layer to control the amount of deicing agent released.

The present invention is not limited to the specific embodiments and descriptions described above, and anyone with ordinary skill in the art to which the present invention pertains may make various modifications without departing from the gist of the present invention as claimed in the claims, and such modifications fall within the protection scope of the present invention.

Claims (7)

Pretreatment step to prepare the base surface on which snow melting paving will be constructed;
A step of forming a pavement layer by spreading an asphalt mixture containing aggregate, asphalt, and snow-removing additives on a cleaned base surface; and
A curing step for curing the above-mentioned packaging layer to form a snow-melting packaging layer;
The above snow removal additive comprises environmentally friendly snow removal capsules and/or waste tire rubber.
The above eco-friendly snow removal capsules are,
A snow melting paving construction method, characterized in that it is manufactured through a core preparation step of preparing a core containing an eco-friendly snow melting agent; and an encapsulation step of reacting the core with a polymerizable polymer and an initiator to encapsulate the core.
In the first paragraph,
A snow-melting pavement construction method, characterized in that the asphalt mixture contains 5 to 30 parts by weight of asphalt and 1 to 19 parts by weight of a snow-removing additive per 100 parts by weight of aggregate.
In the first paragraph,
A snow-melting pavement construction method, characterized in that the asphalt mixture further contains 3 to 9 parts by weight of modified sulfur per 100 parts by weight of aggregate.
In the first paragraph,
A snow melting pavement construction method, characterized in that the core includes at least one eco-friendly snow melting agent selected from the group consisting of calcium magnesium acetate, potassium acetate, sodium acetate, potassium formate, sodium formate, ethylene glycol, and propylene glycol.
delete In the first paragraph,
The above core is a snow melting paving construction method characterized in that an eco-friendly snow melting agent is impregnated into a porous material such as zeolite and/or diatomaceous earth.
In Article 6,
The above eco-friendly snow removal capsules are,
Core preparation step for preparing a core containing an eco-friendly deicer; and
It is manufactured through an encapsulation step of reacting the core with a polymerizable polymer and an initiator to encapsulate it;
A snow melting pavement construction method, characterized in that the core is manufactured by immersing a porous material in an eco-friendly snow melting agent solution or spraying an eco-friendly snow melting agent solution onto the porous material, thereby impregnating the porous material with the eco-friendly snow melting agent solution.